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CVE-2025-13870

Good to know:

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Date: December 2, 2025

Mattermost versions 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to validate the user permission when accessing the files and subscribing to the block in Boards, which allows an authenticated user to access other board files and was able to subscribe to the block from other boards that the user does not have access to

Severity Score

Related Resources (3)

https://nvd.nist.gov/vuln/detail/CVE-2025-13870
https://mattermost.com/security-updates
https://www.mend.io/vulnerability-database/CVE-2025-13870

Severity Score

Weakness Type (CWE)

Missing Authentication for Critical Function

CWE-306

Top Fix

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Upgrade Version

Upgrade to version github.com/mattermost/mattermost - v10.5.13;github.com/mattermost/mattermost - v10.11.5

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): NONE
Availability (A): NONE

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